Air-filtering device



Nov. 12, 1929. J, P, R MmGToN I 1,735fi94 AIR FILTERING DEVICE FiledJan. 6, 1925 v Ha: I

INVEN'I'M f. kfosqph JP Benz. 5 5014 :Patented ov. 12, W2 I JOSEPH PERCYBENIN, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR T REM- ING'I'ONMANUFAG'IURIN'G' COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A (1O'.Et

PORATION OF PENNSYLVANIA -FILTERI1\TG- DEVICE Application filed January6, 1925. Serial 110.1832.

This invention while relating generally to air filtering media isconcerned more particularly with a novel method and means useful inassociation with the carbureter of an internal combustion enginetocleanse the air streamentering said carbureter of dust particles andother impurities conducive of meficient engine operation.

Air filters heretofore designed for the pur- 1o pose referred to havebeen found ob ectionable in that they impose a restraint upon thelfreeflow of air to the carbureter thereby interfering with proper operation,especially at high s eeds, and thus requiring read ustments to be madein said carburet'er to compensate for such induced lag in the air flow.The primary object of my invention is to overcome the difticulties abovenoted by ensuring a free flow of air without appreciable decrease involume even when the engine is running at very high maximum speeds.

Another object of this invention is the provision of an air cleaner ofthe type referredto characterized by the fact that the vapors 2 normallyformed or collecting in the crank casecertain portions of which tend todilute the oil therein-are promptly withdrawn, cleaned and passedthrough the carburetor to efiect valve lubrication with incident rust 9prevention.

A further object is to provide an air cleaner of the typified characterfunctional as a breather which, by virtue of its assembly location,effectively prevents fouling of the exterior parts of the engine anddash with oil that accumulates road dust and dirt.

With the foregoing and other objects in view this invention consists ofan air cleaner which is compact in sizeand readily attachable to anystandard form of carburetor ordinarily employed, and which furthermoreaffords a comparatively long smooth-walled anti-frictional flow-passagewhich is nonresistant to free-flow of air While afi'ording an extensivesurface whereon an oleaginous filmsuch as oil vapor drawn from the crankcase of an internal combustion engine under suctionis constantlymaintained to serve as a medium for intercepting the impalpable andother particles of solid matter suspended in the passing air.

With reference to the drawings, Fig. I is aside elevation of atypicalinternal combustion engine having associated therewith an air filteringdevice conveniently embodying my invention. Fig. II is. a longitudinalsectional View of the air filtering device on a larger scale than thatof the preceding illustration; and

Fig. III is a cross section taken as indicated by the arrows IIIIII inFig. II.

Directing attention first to Fig. 1 of these illustrations, 5 indicatesthe fuel intake manifold of a motor M, and 6 the carbureter, in ad- 5Vance of which my novelair filtering device, comprehensively indicatedat 7, is placed as shown. Or, the air cleaner 7 may be oriented in anyother desirable positioneither in front of, or behind, the carbureter 6.

From Fig. II it will be observed that the air cleaner device 7 comprisesa tubular shell 8 which is fitted at the rear end with an adapter 9 fordirect connection to the air inlet of the carbureter 6, and that saiddevice is surrounded at the forward end by a hollow fitting l0 affordingan annular cavity 11 which communicates with the interior of the. shell8 through a series of ports'12 in the wall of the latter. The fitting 10is connected by so a tube or pipe 13 with the crank case 14 of the motorM at a point above the oil level normally maintained therein, so thatoil vapor is constantly drawn into the tubular shell 8 through the ports12 under the suction 5 of the motor M. The ports 12 are of relativelysmall size so that no appreciable suction or reduced atmosphericpressure is imparted to the crank case interior. 7

Located with in the shell 8 is an insert memher convenientlyalthough notessentially in the form of a spiral 15 that defines a circuitous coursefor the air flowing into the carbureter 6, which afi'ords conjointlywith said shell, an extensive surface over which the oil vapor, diffusedincidental to entry through the ports 12, distributes itself, and itserves to intercept any particles of solid matter suspended in thepassing air. The spiral insert member 15 engages the interior of thepreferably formed integral therewith as illustrated. A v

Although the air is obliged to traverse a circuitous course through thedevice 7 in being filtered before entry into the carbureter 6, no

abrupt directional changes such as would interfere with its free flowandthe proper operation of the carbureter 6are involved. The spiraltherefore provides a comparatively long smooth-walled anti-frictionalflow assa e in a ver small com act s ace in ad.- b

dition to an extensive surface for distribution of the trapping mediumas already explained.

From the foregoing it will be apparent that I have devised a novel andefficient air cleaner which embodies all the features enumerated asexpedient, while it is deemed desirable to particularize certainimportant advantages discerned as a result of intensive experiments.Primarily among these advantages is the effecti'veness of my air filterdevice 7 in reducing the amount of gasoline and water vapor collectingin the engine crank case 14 which as is well knownacts as a diluent ofthe crank case oil. Another important advantage attained is that the oilvapor being drawn in with the carbureted air-and not wholly depositedupon the impact faces of the tubular shell 8 and spiral 15aifords anexcellent lubricator and rust preventativev for certain parts of themotor M difficult to otherwise supply with an anti-friction medium, suchas the valve stems. Again, by closlng up the customary breather pipe andusing the filter device 7 therefor, I eliminate the diffusion of oilvapor about the engine dash and adja-,

cent parts which ordinarily accumulate road dust to an extent thatrenders such surfaces extremely filthy and objectionable.

Finally it will be apparent that the carbureter 6 is assured of amaximum air flow regardless of the speed of the motor M, while thefilter device 7 of my invention may be installed without requiringcompensative adjustments of said carbureter, as was the case withadjuncts heretofore designed to function for a similarpurpose.

Having thus described my invention, I claim:

1. An air filtering device for connection to the air inlet of aninternal combustion engine comprising a smooth-walled conduit having itsouter end apertured at circumferential intervals, means affording anannular cavity exteriorly around the apertures and adapted to conductcrank case vapor thereinto, and a removable spiral insert frictionallyfitting within the aforesaid conduit to define an extensive filteringsurface.

2. An air filtering device for connection to the air inlet of aninternal combustion engine carbureter comprising a smooth-walled conduithaving itsouter end apertured at circumferential intervals, a hollowfitting surrounding said conduit and affording an annular cavitysurrounding the apertures, means for conducting crank case vapordirectly thereinto, and a removable spiral insert frictionally fittingthe aforesaid conduit to define an extensive filtering surface.

3. An air filtering device for connection to the air inlet of aninternal combustion engine carbureter comprising a smooth-walledco'nduit having an adapter at its inner end and alignedly spacedapertures circumferentially about its outer end, a hollow fittingafi'ording an annular cavit exteriorly surrounding the apertures and aapted to conduct'crank case vapor directly thereinto, and a removablespiral insert frictionally fitting the aforesaid conduit to define anextensive filtering surface to collect some of the crank case vapor.

In testimony whereof, I have hereunto signed my name at Philadelphia,Pennsylvania, this 31st day of December, 1924.

JOSEPH PERCY REMINGTON.

